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R30155 Cobalt vs. EN 1.4640 Stainless Steel

Both R30155 cobalt and EN 1.4640 stainless steel are iron alloys. They have 57% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is R30155 cobalt and the bottom bar is EN 1.4640 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
190 to 200
Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 34
51
Fatigue Strength, MPa 310
230 to 250
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 81
77
Shear Strength, MPa 570
440 to 460
Tensile Strength: Ultimate (UTS), MPa 850
620 to 650
Tensile Strength: Yield (Proof), MPa 390
240 to 260

Thermal Properties

Latent Heat of Fusion, J/g 300
280
Maximum Temperature: Corrosion, °C 570
420
Maximum Temperature: Mechanical, °C 1100
930
Melting Completion (Liquidus), °C 1470
1420
Melting Onset (Solidus), °C 1420
1380
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 12
15
Thermal Expansion, µm/m-K 14
16

Otherwise Unclassified Properties

Base Metal Price, % relative 80
14
Density, g/cm3 8.5
7.8
Embodied Carbon, kg CO2/kg material 9.7
2.8
Embodied Energy, MJ/kg 150
40
Embodied Water, L/kg 300
150

Common Calculations

PREN (Pitting Resistance) 37
20
Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
250 to 260
Resilience: Unit (Modulus of Resilience), kJ/m3 370
150 to 170
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 28
22 to 23
Strength to Weight: Bending, points 24
21
Thermal Diffusivity, mm2/s 3.2
4.0
Thermal Shock Resistance, points 21
14 to 15

Alloy Composition

Carbon (C), % 0.080 to 0.16
0.030 to 0.080
Chromium (Cr), % 20 to 22.5
18 to 19
Cobalt (Co), % 18.5 to 21
0
Copper (Cu), % 0
1.3 to 2.0
Iron (Fe), % 24.3 to 36.2
67.4 to 73.6
Manganese (Mn), % 1.0 to 2.0
1.5 to 4.0
Molybdenum (Mo), % 2.5 to 3.5
0
Nickel (Ni), % 19 to 21
5.5 to 6.9
Niobium (Nb), % 0.75 to 1.3
0
Nitrogen (N), % 0 to 0.2
0.030 to 0.11
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0 to 1.0
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.015
Tantalum (Ta), % 0.75 to 1.3
0
Tungsten (W), % 2.0 to 3.0
0